Magic roots - how do you deal with them?

Tyre choice is ballcocks. Hit a wet root wrong and I don't care what tyre you've got on. I love the idiot advice about clearing one root. Most often there's a series of them in varying directions. Get the front over one and yes the back may follow until you hit the next.
If tyre choice is so important, how is it I know several CX riders who run near slicks over the whole winter?
You either get it or you don't.
As said previously, your biggest problem is fear. That's not anything you'll get help with here, you have to sort it yourself.
Also, ignore additional idiot advice to go faster. Speed is never your friend if you're low on skill. The faster you go, the more it will hurt if something goes wrong.
Steady with confidence, light and positive. Look at the way in and then the way out. Never look at something you're trying to avoid... You'll hit it! Practice again and again.

It's not bollocks at all. Wet roots are one of the most difficult things for tyres, and the type of rubber has a significant effect.

You talk as if I've never ridden wet roots in 20 years of MTBing. I wish that were the case I've ridden a lot of roots, with a lot of different tyres, and it makes a difference. As to why CX riders run slicks, well I have no idea. They're weirdos. Perhaps it's because they like to run carrying their bike.